1867 ] 271 
This minute insect is abuudant in autumn in the interiors of houses 
and warehouses, even in the heart of the City of London. In the room 
in wliicli I now write it swarms every year during a few days in August 
or September, according to the season ; but lasts a very short time, 
generally disappearing entirely in a week from the advent of the first- 
seen examples. 
2. — C^ciLius TLxWiDus, Stephens. 
Psocusflavidm, Stepli., 111. p. 122, 20 (1S36) ; Eamb. Ncvrop. p. 323, 
9; BrauerK A. p. 33 ; Hag. Ent. Ann. 1861, p. 27, 13. P.Jlavicans, 
Steph. 111. p. 123, 21 (1836). P. ochropterus, Steph. 111. p. 122, 19 
(1836). P. suhpionctatus, Steph. 111. p. 126, 34 (1836) ? P. boreelhs 
Zett. Insect. Lapp. col. 1053, 6 (1840). Gcecilius strigosus, Curt. B. E. 
648, 26 (1837^. 
Antennce rather short, slightly pilose in $ , fuscous, the basal half (excepting 
the two first joints) yellowish. Head yellow ; the crown marked with brown in the 
middle about the ocelli. Thorax yellow, marked with shining brown. Ahdomen 
yellow. Legs yellow, the tarsi brownish. Anterior wings elongate, sub-hyaline, 
tinged with greyish-yellow ; veins strong, brown, and most of them margined with 
brown ; pterostignia elongate, dilated in the middle ; free posterior marginal cellule 
broad, the apex broadly and flatly rounded; loosterior ivings hyaline, scarcely 
tinged, the veins finer. Length of body 1-1^'" ; expanse of fore-wings 3-3^'". 
A common species on palings. 
3. — C^ciLius OBSOLETUS Stephens. 
Fsocus ohsoletus Steph. 111. p. 123, 22 (1836). 
Antenn(s short, dark reddish-brown, slightly pilose in S ■ Head and thorax 
uniform reddish-yellow. Ahdomen paler. Legs reddish-yellow. Anterior wings 
pale smoky greyish-yellow ; veins very fine, brownish, not margined ; pterostigma 
more elongate than in C. flavidus, dilated at the apex, which is more abrupt, 
reddish or smoky -yellowish ; the free posterior cellule similar to that in P. flavidus, 
but smaller. Posterior wings tinged as in the anterior, but paler. 
Length of body l-lj'" ; expanse of fore-wings 2^-3^.'" 
Probably equally common with No. 2, but overlooked or confused 
with that species. 
I have seen numerous specimens of both sexes, and am convinced 
that it is neither an immature nor sexual form oi flavidus. The colouring 
is more reddish and obscure, the veins very fine, and the structural 
characters of the latter somewhat different. 
In Mr. Marshall's collection I find two specimens that I believe 
form another closely albed species ; the wings are muck broader and 
onore obtusely rounded, hyaline, with the least perceptible tinge of 
colouring, and with exceedingly fine veins. In a group in which the 
